What are some effective Warhammer 40k stratagems that players can utilize to gain a tactical advantage on the battlefield?

Some effective Warhammer 40k stratagems that players can use for a tactical advantage include "Counter-Offensive" to strike back in close combat, "Fire Overwatch" to shoot at charging enemies, and "Tide of Traitors" to bring back eliminated units. These stratagems can help players outmaneuver their opponents and secure victory on the battlefield.